Used as a response on message boards when a user posts a long message.

Also the name of a popular "off topic" message board, The Tldr (Thetldr.org/forums)

Poster one:

"The Embarras River (pronounced "EM-brah" or "AM-brah" IPA: &#712;æm·br&#596;) is a tributary of the Wabash River, 185 mi (298 km) long, in southeastern Illinois in the United States. The waters of the Embarras reach the Gulf of Mexico via the Wabash, Ohio, and Mississippi Rivers. The river drains a watershed of approximately 1,566,450 acres (2,440 sq mi/6,320 km²) in an agricultural region. The name comes from French explorers, who used the term embarras for river obstacles, blockages, and..."

Frequently used acronym by lazy, ignorant people in Internet Forums, where their urge to type something exceeds their ability to read something or if they generally lack semantic ability to either comprehend or respond to a post due to underdeveloped brain.

Stating that they were to lazy reading someone else's post just confirms the ignorant attitude and also often destroys the discussion in the thread.

The average IQ of people typing TLDR in Internet forums is about 64.

The average IQ of people typing TLDR in Internet forums is about 64.

Since I am a lonely masturbating boy with no brain I have no capacity to read all you said, but due to my lonely social life I still feel like typing something in this thread, I will type TLDR.